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  <h2>性能优化</h2>
  <ul>
    <li>尽量减少HTTP请求 (Make Fewer HTTP Requests)</li>
    <li>减少DNS 查找 (Reduce DNS Lookups)</li>
    <li> 避免重定向 (Avoid Redirects)</li>
    <li>使得 Ajax 可缓存 (Make Ajax Cacheable)</li>
    <li>延迟载入组件 (Post-load Components)</li>
    <li>预载入组件 (Preload Components)</li>
    <li>减少DOM元素数量 (Reduce the Number of DOM Elements)</li>
    <li>切分组件到多个域 (Split Components Across Domains)</li>
    <li>最小化iframe的数量 (Minimize the Number of iframes)</li>
    <li>杜绝 http404错误 (No 404s)</li>
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